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UnpackUtils.cs
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using System;
/*
** UnpackUtils.cs
**
** Copyright (c) 2010-2016 Peter McQuillan
**
** All Rights Reserved.
**
** Distributed under the BSD Software License (see license.txt)
***/
namespace WavPack
{
class UnpackUtils
{
///////////////////////////// executable code ////////////////////////////////
// This function initializes everything required to unpack a WavPack block
// and must be called before unpack_samples() is called to obtain audio data.
// It is assumed that the WavpackHeader has been read into the wps.wphdr
// (in the current WavpackStream). This is where all the metadata blocks are
// scanned up to the one containing the audio bitstream.
internal static int unpack_init(WavpackContext wpc)
{
WavpackStream wps = wpc.stream;
WavpackMetadata wpmd = new WavpackMetadata();
if (wps.wphdr.block_samples > 0 && wps.wphdr.block_index != 0xFFFFFFFF)
wps.sample_index = wps.wphdr.block_index;
wps.mute_error = false;
wps.crc = wps.crc_x = -1;
wps.wvbits.sr = 0;
while (MetadataUtils.read_metadata_buff(wpc, wpmd) == Defines.TRUE)
{
if (MetadataUtils.process_metadata(wpc, wpmd) == Defines.FALSE)
{
wpc.error_message = "invalid metadata id " + wpmd.id;
return Defines.FALSE;
}
}
if (wpmd.bytecount != wpc.stream.wphdr.ckSize)
{
wpc.error_message = "invalid reading WavPack metadata block";
return Defines.FALSE;
}
if (wps.wphdr.block_samples != 0 && (wps.wphdr.flags & Defines.DSD_FLAG) > 0 ? !wps.dsd.ready : (wps.wvbits == null || wps.wvbits.end == 0))
{
wpc.error_message = "invalid WavPack file";
return Defines.FALSE;
}
if (wps.wphdr.block_samples != 0)
{
if ((wps.wphdr.flags & Defines.INT32_DATA) != 0 && wps.int32_sent_bits != 0 && wps.wvxbits == null)
wpc.lossy_blocks = true;
if ((wps.wphdr.flags & Defines.FLOAT_DATA) != 0 && (wps.float_flags & (Defines.FLOAT_EXCEPTIONS | Defines.FLOAT_ZEROS_SENT | Defines.FLOAT_SHIFT_SENT | Defines.FLOAT_SHIFT_SAME)) != 0)
wpc.lossy_blocks = true;
}
wpc.stream = wps;
return Defines.TRUE;
}
// This function initialzes the main bitstream for audio samples, which must
// be in the "wv" file.
internal static int init_wv_bitstream(WavpackContext wpc, WavpackMetadata wpmd)
{
WavpackStream wps = wpc.stream;
if (!wpmd.copy_data())
return Defines.FALSE;
//if (wpmd.hasdata)
wps.wvbits = BitsUtils.bs_open_read(wpmd.data, 0, wpmd.byte_length, wpc.infile, 0, 0);
/*else if (wpmd.byte_length > 0)
{
int len = wpmd.byte_length & 1;
wps.wvbits = BitsUtils.bs_open_read(wpc.read_buffer, -1, wpc.read_buffer.Length, wpc.infile, wpmd.byte_length + len, 1);
}*/
return Defines.TRUE;
}
// This function initializes the "correction" bitstream for audio samples,
// which currently must be in the "wvc" file.
internal static int init_wvc_bitstream(WavpackContext wpc, WavpackMetadata wpmd)
{
WavpackStream wps = wpc.stream;
if ((wpmd.byte_length & 1) > 0 || !wpmd.copy_data())
return Defines.FALSE;
wps.wvcbits = BitsUtils.bs_open_read(wpmd.data, 0, wpmd.byte_length, wpc.infile, 0, 0);
return Defines.TRUE;
}
// This function initializes the "extra" bitstream for audio samples which
// contains the information required to losslessly decompress 32-bit float data
// or integer data that exceeds 24 bits. This bitstream is in the "wv" file
// for pure lossless data or the "wvc" file for hybrid lossless. This data
// would not be used for hybrid lossy mode. There is also a 32-bit CRC stored
// in the first 4 bytes of these blocks.
internal static int init_wvx_bitstream(WavpackContext wpc, WavpackMetadata wpmd)
{
WavpackStream wps = wpc.stream;
int counter = 0;
if (wpmd.byte_length <= 4 || (wpmd.byte_length & 1) > 0 || !wpmd.copy_data())
return Defines.FALSE;
var cp = wpmd.data[counter++];
wps.crc_mvx = cp;
wps.crc_mvx |= wpmd.data[counter++] << 8;
wps.crc_mvx |= wpmd.data[counter++] << 16;
wps.crc_mvx |= wpmd.data[counter++] << 24;
wps.wvxbits = BitsUtils.bs_open_read(wpmd.data, counter, wpmd.byte_length, wpc.infile, 0, 0);
// the new WVX bitstream format starts with one or two new 5-bit fields
if (wpmd.id == Defines.ID_WVX_NEW_BITSTREAM)
{
if ((wps.wphdr.flags & Defines.FLOAT_DATA) > 0)
{
wps.float_min_shifted_zeros = (byte)(BitsUtils.getbits(5, wps.wvxbits) & 0x1f);
wps.float_max_shifted_ones = (byte)(BitsUtils.getbits(5, wps.wvxbits) & 0x1f);
}
else
{
wps.int32_max_width = (byte)(BitsUtils.getbits(5, wps.wvxbits) & 0x1f);
}
}
return Defines.TRUE;
}
// Read decorrelation terms from specified metadata block into the
// decorr_passes array. The terms range from -3 to 8, plus 17 & 18;
// other values are reserved and generate errors for now. The delta
// ranges from 0 to 7 with all values valid. Note that the terms are
// stored in the opposite order in the decorr_passes array compared
// to packing.
internal static int read_decorr_terms(WavpackStream wps, WavpackMetadata wpmd)
{
int termcnt = wpmd.byte_length;
byte[] byteptr = wpmd.data;
WavpackStream tmpwps = new WavpackStream();
int counter = 0;
int dcounter = 0;
if (termcnt > Defines.MAX_NTERMS)
return Defines.FALSE;
tmpwps.num_terms = termcnt;
dcounter = termcnt - 1;
for (dcounter = termcnt - 1; dcounter >= 0; dcounter--)
{
tmpwps.decorr_passes[dcounter].term = (short)((int)(byteptr[counter] & 0x1f) - 5);
tmpwps.decorr_passes[dcounter].delta = (short)((byteptr[counter] >> 5) & 0x7);
counter++;
if (tmpwps.decorr_passes[dcounter].term < -3 || (tmpwps.decorr_passes[dcounter].term > Defines.MAX_TERM && tmpwps.decorr_passes[dcounter].term < 17) || tmpwps.decorr_passes[dcounter].term > 18)
return Defines.FALSE;
}
wps.decorr_passes = tmpwps.decorr_passes;
wps.num_terms = tmpwps.num_terms;
return Defines.TRUE;
}
// Read decorrelation weights from specified metadata block into the
// decorr_passes array. The weights range +/-1024, but are rounded and
// truncated to fit in signed chars for metadata storage. Weights are
// separate for the two channels and are specified from the "last" term
// (first during encode). Unspecified weights are set to zero.
internal static int read_decorr_weights(WavpackStream wps, WavpackMetadata wpmd)
{
int termcnt = wpmd.byte_length, tcount;
byte[] byteptr = wpmd.data;
decorr_pass dpp = new decorr_pass();
int counter = 0;
int dpp_idx;
int myiterator = 0;
if ((wps.wphdr.flags & (Defines.MONO_FLAG | Defines.FALSE_STEREO)) == 0)
termcnt /= 2;
if (termcnt > wps.num_terms)
{
return Defines.FALSE;
}
for (tcount = wps.num_terms; tcount > 0; tcount--)
dpp.weight_A = dpp.weight_B = 0;
myiterator = wps.num_terms;
while (termcnt > 0)
{
dpp_idx = myiterator - 1;
dpp.weight_A = (short)WordsUtils.restore_weight((sbyte)byteptr[counter]);
wps.decorr_passes[dpp_idx].weight_A = dpp.weight_A;
counter++;
if ((wps.wphdr.flags & (Defines.MONO_FLAG | Defines.FALSE_STEREO)) == 0)
{
dpp.weight_B = (short)WordsUtils.restore_weight((sbyte)byteptr[counter]);
counter++;
}
wps.decorr_passes[dpp_idx].weight_B = dpp.weight_B;
myiterator--;
termcnt--;
}
return Defines.TRUE;
}
// Read decorrelation samples from specified metadata block into the
// decorr_passes array. The samples are signed 32-bit values, but are
// converted to signed log2 values for storage in metadata. Values are
// stored for both channels and are specified from the "last" term
// (first during encode) with unspecified samples set to zero. The
// number of samples stored varies with the actual term value, so
// those must obviously come first in the metadata.
internal static int read_decorr_samples(WavpackStream wps, WavpackMetadata wpmd)
{
byte[] byteptr = wpmd.data;
decorr_pass dpp = new decorr_pass();
int tcount;
int counter = 0;
int dpp_index = 0;
int uns_buf0, uns_buf1, uns_buf2, uns_buf3;
int sample_counter = 0;
dpp_index = 0;
for (tcount = wps.num_terms; tcount > 0; tcount--)
{
dpp.term = wps.decorr_passes[dpp_index].term;
for (int internalc = 0; internalc < Defines.MAX_TERM; internalc++)
{
dpp.samples_A[internalc] = 0;
dpp.samples_B[internalc] = 0;
wps.decorr_passes[dpp_index].samples_A[internalc] = 0;
wps.decorr_passes[dpp_index].samples_B[internalc] = 0;
}
dpp_index++;
}
if (wps.wphdr.version == 0x402 && (wps.wphdr.flags & Defines.HYBRID_FLAG) > 0)
{
counter += 2;
if ((wps.wphdr.flags & (Defines.MONO_FLAG | Defines.FALSE_STEREO)) == 0)
counter += 2;
}
dpp_index--;
while (counter < wpmd.byte_length)
{
if (dpp.term > Defines.MAX_TERM)
{
uns_buf0 = byteptr[counter];
uns_buf1 = byteptr[counter + 1];
uns_buf2 = byteptr[counter + 2];
uns_buf3 = byteptr[counter + 3];
dpp.samples_A[0] = WordsUtils.exp2s((short)(uns_buf0 + (uns_buf1 << 8)));
dpp.samples_A[1] = WordsUtils.exp2s((short)(uns_buf2 + (uns_buf3 << 8)));
counter += 4;
if ((wps.wphdr.flags & (Defines.MONO_FLAG | Defines.FALSE_STEREO)) == 0)
{
uns_buf0 = byteptr[counter];
uns_buf1 = byteptr[counter + 1];
uns_buf2 = byteptr[counter + 2];
uns_buf3 = byteptr[counter + 3];
dpp.samples_B[0] = WordsUtils.exp2s((short)(uns_buf0 + (uns_buf1 << 8)));
dpp.samples_B[1] = WordsUtils.exp2s((short)(uns_buf2 + (uns_buf3 << 8)));
counter += 4;
}
}
else if (dpp.term < 0)
{
uns_buf0 = byteptr[counter];
uns_buf1 = byteptr[counter + 1];
uns_buf2 = byteptr[counter + 2];
uns_buf3 = byteptr[counter + 3];
dpp.samples_A[0] = WordsUtils.exp2s((short)(uns_buf0 + (uns_buf1 << 8)));
dpp.samples_B[0] = WordsUtils.exp2s((short)(uns_buf2 + (uns_buf3 << 8)));
counter += 4;
}
else
{
int m = 0, cnt = dpp.term;
while (cnt > 0)
{
uns_buf0 = byteptr[counter];
uns_buf1 = byteptr[counter + 1];
dpp.samples_A[m] = WordsUtils.exp2s((short)(uns_buf0 + (uns_buf1 << 8)));
counter += 2;
if ((wps.wphdr.flags & (Defines.MONO_FLAG | Defines.FALSE_STEREO)) == 0)
{
uns_buf0 = byteptr[counter];
uns_buf1 = byteptr[counter + 1];
dpp.samples_B[m] = WordsUtils.exp2s((short)(uns_buf0 + (uns_buf1 << 8)));
counter += 2;
}
m++;
cnt--;
}
}
for (sample_counter = 0; sample_counter < Defines.MAX_TERM; sample_counter++)
{
wps.decorr_passes[dpp_index].samples_A[sample_counter] = dpp.samples_A[sample_counter];
wps.decorr_passes[dpp_index].samples_B[sample_counter] = dpp.samples_B[sample_counter];
}
dpp_index--;
}
return Defines.TRUE;
}
// Read the int32 data from the specified metadata into the specified stream.
// This data is used for integer data that has more than 24 bits of magnitude
// or, in some cases, used to eliminate redundant bits from any audio stream.
internal static int read_int32_info(WavpackStream wps, WavpackMetadata wpmd)
{
int bytecnt = wpmd.byte_length;
byte[] byteptr = wpmd.data;
int counter = 0;
if (bytecnt != 4)
return Defines.FALSE; // should also return 0
wps.int32_sent_bits = byteptr[counter++];
wps.int32_zeros = byteptr[counter++];
wps.int32_ones = byteptr[counter++];
wps.int32_dups = byteptr[counter++];
return Defines.TRUE;
}
// Read multichannel information from metadata. The first byte is the total
// number of channels and the following bytes represent the channel_mask
// as described for Microsoft WAVEFORMATEX.
internal static int read_channel_info(WavpackContext wpc, WavpackMetadata wpmd)
{
int bytecnt = wpmd.byte_length, shift = 0;
byte[] byteptr = wpmd.data;
int counter = 0;
long mask = 0;
if (bytecnt == 0 || bytecnt > 5)
return Defines.FALSE;
wpc.config.num_channels = byteptr[counter++];
while (bytecnt >= 0)
{
mask |= (long)(byteptr[counter++] << shift);
shift += 8;
bytecnt--;
}
wpc.config.channel_mask = mask;
return Defines.TRUE;
}
// Read configuration information from metadata.
internal static int read_new_config_info(WavpackContext wpc, WavpackMetadata wpmd)
{
int bytecnt = wpmd.byte_length;
byte[] byteptr = wpmd.data;
int counter = 0;
wpc.five = true;
if (bytecnt >= 1)
wpc.file_format = (eFileFormat)byteptr[counter++];
return Defines.TRUE;
}
// Read configuration information from metadata.
internal static int read_config_info(WavpackContext wpc, WavpackMetadata wpmd)
{
int bytecnt = wpmd.byte_length;
byte[] byteptr = wpmd.data;
int counter = 0;
if (bytecnt >= 3)
{
wpc.config.flags &= 0xff;
wpc.config.flags |= (long)(byteptr[counter++] << 8);
wpc.config.flags |= (long)(byteptr[counter++] << 16);
wpc.config.flags |= (long)(byteptr[counter++] << 24);
}
if (bytecnt >= 4 && (wpc.config.flags & Defines.CONFIG_EXTRA_MODE) > 0) {
wpc.config.xmode = byteptr[counter++];
bytecnt--;
}
if (bytecnt >= 5)
wpc.five = true;
return Defines.TRUE;
}
// Read non-standard sampling rate from metadata.
internal static int read_sample_rate(WavpackContext wpc, WavpackMetadata wpmd)
{
int bytecnt = wpmd.byte_length;
byte[] byteptr = wpmd.data;
int counter = 0;
if (bytecnt == 3)
{
wpc.config.sample_rate = byteptr[counter++];
wpc.config.sample_rate |= (long)(byteptr[counter++] << 8);
wpc.config.sample_rate |= (long)(byteptr[counter++] << 16);
}
return Defines.TRUE;
}
internal static int read_header(WavpackContext wpc, WavpackMetadata wpmd)
{
var bytes = new byte[wpmd.byte_length];
Array.Copy(wpmd.data, bytes, bytes.Length);
wpc.header = bytes;
return Defines.TRUE;
}
internal static int read_trailer(WavpackContext wpc, WavpackMetadata wpmd)
{
var bytes = new byte[wpmd.byte_length];
Array.Copy(wpmd.data, bytes, bytes.Length);
wpc.trailer = bytes;
return Defines.TRUE;
}
// This monster actually unpacks the WavPack bitstream(s) into the specified
// buffer as 32-bit integers or floats (depending on orignal data). Lossy
// samples will be clipped to their original limits (i.e. 8-bit samples are
// clipped to -128/+127) but are still returned in ints. It is up to the
// caller to potentially reformat this for the final output including any
// multichannel distribution, block alignment or endian compensation. The
// function unpack_init() must have been called and the entire WavPack block
// must still be visible (although wps.blockbuff will not be accessed again).
// For maximum clarity, the function is broken up into segments that handle
// various modes. This makes for a few extra infrequent flag checks, but
// makes the code easier to follow because the nesting does not become so
// deep. For maximum efficiency, the conversion is isolated to tight loops
// that handle an entire buffer. The function returns the total number of
// samples unpacked, which can be less than the number requested if an error
// occurs or the end of the block is reached.
internal static long unpack_samples(WavpackContext wpc, int[] buffer, long sample_count, int bufferStartPos)
{
WavpackStream wps = wpc.stream;
long flags = wps.wphdr.flags;
long i;
int crc = wps.crc;
int mute_limit = (int)((1L << (int)((flags & Defines.MAG_MASK) >> Defines.MAG_LSB)) + 2);
decorr_pass dpp;
int tcount;
int buffer_counter = 0;
int samples_processed = 0;
if (wps.sample_index + sample_count > wps.wphdr.block_index + wps.wphdr.block_samples)
sample_count = wps.wphdr.block_index + wps.wphdr.block_samples - wps.sample_index;
if (wps.mute_error)
{
long tempc;
if ((flags & Defines.MONO_FLAG) > 0)
tempc = sample_count;
else
tempc = 2 * sample_count;
buffer_counter = bufferStartPos;
while (tempc-- > 0)
buffer[buffer_counter++] = 0;
wps.sample_index += sample_count;
return sample_count;
}
if ((flags & Defines.HYBRID_FLAG) > 0)
mute_limit *= 2;
///////////////////// handle version 4 mono data /////////////////////////
if ((flags & (Defines.MONO_FLAG | Defines.FALSE_STEREO)) > 0)
{
int dpp_index = 0;
i = WordsUtils.get_words(sample_count, flags, wps.w, wps.wvbits, buffer, bufferStartPos);
for (tcount = wps.num_terms; tcount > 0; tcount--, dpp_index++)
{
dpp = wps.decorr_passes[dpp_index];
decorr_mono_pass(dpp, buffer, sample_count, bufferStartPos);
}
int bf_abs;
int crclimit = (int)(sample_count + bufferStartPos);
for (int q = bufferStartPos; q < crclimit; q++)
{
var bf_i = buffer[q];
bf_abs = bf_i < 0 ? -bf_i : bf_i;
if (bf_abs > mute_limit)
{
i = q;
break;
}
crc = crc * 3 + bf_i;
}
}
//////////////////// handle version 4 stereo data ////////////////////////
else
{
samples_processed = WordsUtils.get_words(sample_count, flags, wps.w, wps.wvbits, buffer, bufferStartPos);
i = samples_processed;
if (sample_count < 16)
{
int dpp_index = 0;
for (tcount = wps.num_terms; tcount > 0; tcount--, dpp_index++)
{
dpp = wps.decorr_passes[dpp_index];
decorr_stereo_pass(dpp, buffer, sample_count, bufferStartPos);
}
}
else
{
int dpp_index = 0;
for (tcount = wps.num_terms; tcount > 0; tcount--, dpp_index++)
{
dpp = wps.decorr_passes[dpp_index];
decorr_stereo_pass(dpp, buffer, 8, bufferStartPos);
decorr_stereo_pass_cont(dpp, buffer, sample_count - 8, bufferStartPos + 16);
}
}
if ((flags & Defines.JOINT_STEREO) > 0)
{
int bf_abs, bf1_abs;
for (buffer_counter = 0; buffer_counter < sample_count * 2; buffer_counter += 2)
{
buffer[buffer_counter + bufferStartPos] += (buffer[buffer_counter + 1 + bufferStartPos] -= (buffer[buffer_counter + bufferStartPos] >> 1));
bf_abs = (buffer[buffer_counter + bufferStartPos] < 0 ? -buffer[buffer_counter + bufferStartPos] : buffer[buffer_counter + bufferStartPos]);
bf1_abs = (buffer[buffer_counter + 1 + bufferStartPos] < 0 ? -buffer[buffer_counter + 1 + bufferStartPos] : buffer[buffer_counter + 1 + bufferStartPos]);
if (bf_abs > mute_limit || bf1_abs > mute_limit)
{
i = buffer_counter / 2;
break;
}
crc = (crc * 3 + buffer[buffer_counter + bufferStartPos]) * 3 + buffer[buffer_counter + 1 + bufferStartPos];
}
}
else
{
int bf_abs, bf1_abs;
for (buffer_counter = 0; buffer_counter < sample_count * 2; buffer_counter += 2)
{
bf_abs = (buffer[buffer_counter + bufferStartPos] < 0 ? -buffer[buffer_counter + bufferStartPos] : buffer[buffer_counter + bufferStartPos]);
bf1_abs = (buffer[buffer_counter + 1 + bufferStartPos] < 0 ? -buffer[buffer_counter + 1 + bufferStartPos] : buffer[buffer_counter + 1 + bufferStartPos]);
if (bf_abs > mute_limit || bf1_abs > mute_limit)
{
i = buffer_counter / 2;
break;
}
crc = (crc * 3 + buffer[buffer_counter + bufferStartPos]) * 3 + buffer[buffer_counter + 1 + bufferStartPos];
}
}
}
if (i != sample_count)
{
long sc = 0;
if ((flags & Defines.MONO_FLAG) > 0)
sc = sample_count;
else
sc = 2 * sample_count;
buffer_counter = bufferStartPos;
while (sc-- > 0)
buffer[buffer_counter++] = 0;
wps.mute_error = true;
i = sample_count;
}
fixup_samples(wps, buffer, i, bufferStartPos);
if ((flags & Defines.FALSE_STEREO) > 0)
{
int dest_idx = (int)i * 2;
int src_idx = (int)i;
int c = (int)i;
while (c-- > 0)
{
src_idx--;
buffer[--dest_idx + bufferStartPos] = buffer[src_idx + bufferStartPos];
buffer[--dest_idx + bufferStartPos] = buffer[src_idx + bufferStartPos];
}
}
wps.sample_index += i;
wps.crc = crc;
return i;
}
internal static void decorr_stereo_pass(decorr_pass dpp, int[] buffer, long sample_count, int buf_idx)
{
int delta = dpp.delta;
int weight_A = dpp.weight_A;
int weight_B = dpp.weight_B;
int sam_A, sam_B;
int m, k;
int bptr_counter = 0;
switch (dpp.term)
{
case 17:
for (bptr_counter = buf_idx; bptr_counter < buf_idx + sample_count * 2; bptr_counter += 2)
{
sam_A = 2 * dpp.samples_A[0] - dpp.samples_A[1];
dpp.samples_A[1] = dpp.samples_A[0];
dpp.samples_A[0] = (int)((weight_A * (long)sam_A + 512) >> 10) + buffer[bptr_counter];
if (sam_A != 0 && buffer[bptr_counter] != 0)
{
if ((sam_A ^ buffer[bptr_counter]) < 0)
weight_A -= delta;
else
weight_A += delta;
}
buffer[bptr_counter] = dpp.samples_A[0];
sam_A = 2 * dpp.samples_B[0] - dpp.samples_B[1];
dpp.samples_B[1] = dpp.samples_B[0];
dpp.samples_B[0] = (int)((weight_B * (long)sam_A + 512) >> 10) + buffer[bptr_counter + 1];
if (sam_A != 0 && buffer[bptr_counter + 1] != 0)
{
if ((sam_A ^ buffer[bptr_counter + 1]) < 0)
weight_B -= delta;
else
weight_B += delta;
}
buffer[bptr_counter + 1] = dpp.samples_B[0];
}
break;
case 18:
for (bptr_counter = buf_idx; bptr_counter < buf_idx + sample_count * 2; bptr_counter += 2)
{
sam_A = (3 * dpp.samples_A[0] - dpp.samples_A[1]) >> 1;
dpp.samples_A[1] = dpp.samples_A[0];
dpp.samples_A[0] = (int)((weight_A * (long)sam_A + 512) >> 10) + buffer[bptr_counter];
if (sam_A != 0 && buffer[bptr_counter] != 0)
{
if ((sam_A ^ buffer[bptr_counter]) < 0)
weight_A -= delta;
else
weight_A += delta;
}
buffer[bptr_counter] = dpp.samples_A[0];
sam_A = (3 * dpp.samples_B[0] - dpp.samples_B[1]) >> 1;
dpp.samples_B[1] = dpp.samples_B[0];
dpp.samples_B[0] = (int)((weight_B * (long)sam_A + 512) >> 10) + buffer[bptr_counter + 1];
if (sam_A != 0 && buffer[bptr_counter + 1] != 0)
{
if ((sam_A ^ buffer[bptr_counter + 1]) < 0)
weight_B -= delta;
else
weight_B += delta;
}
buffer[bptr_counter + 1] = dpp.samples_B[0];
}
break;
case -1:
for (bptr_counter = buf_idx; bptr_counter < buf_idx + sample_count * 2; bptr_counter += 2)
{
sam_A = buffer[bptr_counter] + (int)((weight_A * (long)dpp.samples_A[0] + 512) >> 10);
if ((dpp.samples_A[0] ^ buffer[bptr_counter]) < 0)
{
if (dpp.samples_A[0] != 0 && buffer[bptr_counter] != 0 && (weight_A -= delta) < -1024)
weight_A = (weight_A < 0) ? -1024 : 1024;
}
else
{
if (dpp.samples_A[0] != 0 && buffer[bptr_counter] != 0 && (weight_A += delta) > 1024)
weight_A = (weight_A < 0) ? -1024 : 1024;
}
buffer[bptr_counter] = sam_A;
dpp.samples_A[0] = buffer[bptr_counter + 1] + (int)((weight_B * (long)sam_A + 512) >> 10);
if ((sam_A ^ buffer[bptr_counter + 1]) < 0)
{
if (sam_A != 0 && buffer[bptr_counter + 1] != 0 && (weight_B -= delta) < -1024)
weight_B = (weight_B < 0) ? -1024 : 1024;
}
else
{
if (sam_A != 0 && buffer[bptr_counter + 1] != 0 && (weight_B += delta) > 1024)
weight_B = (weight_B < 0) ? -1024 : 1024;
}
buffer[bptr_counter + 1] = dpp.samples_A[0];
}
break;
case -2:
sam_B = 0;
sam_A = 0;
for (bptr_counter = buf_idx; bptr_counter < buf_idx + sample_count * 2; bptr_counter += 2)
{
sam_B = buffer[bptr_counter + 1] + (int)((weight_B * (long)dpp.samples_B[0] + 512) >> 10);
if ((dpp.samples_B[0] ^ buffer[bptr_counter + 1]) < 0)
{
if (dpp.samples_B[0] != 0 && buffer[bptr_counter + 1] != 0 && (weight_B -= delta) < -1024)
weight_B = (weight_B < 0) ? -1024 : 1024;
}
else
{
if (dpp.samples_B[0] != 0 && buffer[bptr_counter + 1] != 0 && (weight_B += delta) > 1024)
weight_B = (weight_B < 0) ? -1024 : 1024;
}
buffer[bptr_counter + 1] = sam_B;
dpp.samples_B[0] = buffer[bptr_counter] + (int)((weight_A * (long)sam_B + 512) >> 10);
if ((sam_B ^ buffer[bptr_counter]) < 0)
{
if (sam_B != 0 && buffer[bptr_counter] != 0 && (weight_A -= delta) < -1024)
weight_A = (weight_A < 0) ? -1024 : 1024;
}
else
{
if (sam_B != 0 && buffer[bptr_counter] != 0 && (weight_A += delta) > 1024)
weight_A = (weight_A < 0) ? -1024 : 1024;
}
buffer[bptr_counter] = dpp.samples_B[0];
}
break;
case -3:
sam_A = 0;
for (bptr_counter = buf_idx; bptr_counter < buf_idx + sample_count * 2; bptr_counter += 2)
{
sam_A = buffer[bptr_counter] + (int)((weight_A * (long)dpp.samples_A[0] + 512) >> 10);
if ((dpp.samples_A[0] ^ buffer[bptr_counter]) < 0)
{
if (dpp.samples_A[0] != 0 && buffer[bptr_counter] != 0 && (weight_A -= delta) < -1024)
weight_A = (weight_A < 0) ? -1024 : 1024;
}
else
{
if (dpp.samples_A[0] != 0 && buffer[bptr_counter] != 0 && (weight_A += delta) > 1024)
weight_A = (weight_A < 0) ? -1024 : 1024;
}
sam_B = buffer[bptr_counter + 1] + (int)((weight_B * (long)dpp.samples_B[0] + 512) >> 10);
if ((dpp.samples_B[0] ^ buffer[bptr_counter + 1]) < 0)
{
if (dpp.samples_B[0] != 0 && buffer[bptr_counter + 1] != 0 && (weight_B -= delta) < -1024)
weight_B = (weight_B < 0) ? -1024 : 1024;
}
else
{
if (dpp.samples_B[0] != 0 && buffer[bptr_counter + 1] != 0 && (weight_B += delta) > 1024)
weight_B = (weight_B < 0) ? -1024 : 1024;
}
buffer[bptr_counter] = dpp.samples_B[0] = sam_A;
buffer[bptr_counter + 1] = dpp.samples_A[0] = sam_B;
}
break;
default:
sam_A = 0;
for (m = 0, k = dpp.term & (Defines.MAX_TERM - 1), bptr_counter = buf_idx; bptr_counter < buf_idx + sample_count * 2; bptr_counter += 2)
{
sam_A = dpp.samples_A[m];
dpp.samples_A[k] = (int)((weight_A * (long)sam_A + 512) >> 10) + buffer[bptr_counter];
if (sam_A != 0 && buffer[bptr_counter] != 0)
{
if ((sam_A ^ buffer[bptr_counter]) < 0)
weight_A -= delta;
else
weight_A += delta;
}
buffer[bptr_counter] = dpp.samples_A[k];
sam_A = dpp.samples_B[m];
dpp.samples_B[k] = (int)((weight_B * (long)sam_A + 512) >> 10) + buffer[bptr_counter + 1];
if (sam_A != 0 && buffer[bptr_counter + 1] != 0)
{
if ((sam_A ^ buffer[bptr_counter + 1]) < 0)
weight_B -= delta;
else
weight_B += delta;
}
buffer[bptr_counter + 1] = dpp.samples_B[k];
m = (m + 1) & (Defines.MAX_TERM - 1);
k = (k + 1) & (Defines.MAX_TERM - 1);
}
if (m != 0)
{
int[] temp_samples = new int[Defines.MAX_TERM];
for (int t = 0; t < dpp.samples_A.Length; t++)
{
temp_samples[t] = dpp.samples_A[t];
}
for (k = 0; k < Defines.MAX_TERM; k++, m++)
dpp.samples_A[k] = temp_samples[m & (Defines.MAX_TERM - 1)];
Array.Copy(dpp.samples_B, 0, temp_samples, 0, dpp.samples_B.Length);
for (k = 0; k < Defines.MAX_TERM; k++, m++)
dpp.samples_B[k] = temp_samples[m & (Defines.MAX_TERM - 1)];
}
break;
}
dpp.weight_A = (short)weight_A;
dpp.weight_B = (short)weight_B;
}
internal static void decorr_stereo_pass_cont(decorr_pass dpp, int[] buffer, long sample_count, int buf_idx)
{
int delta = dpp.delta, weight_A = dpp.weight_A, weight_B = dpp.weight_B;
int tptr;
int sam_A, sam_B;
int k, i;
int buffer_index = buf_idx;
long end_index = buf_idx + sample_count * 2;
switch (dpp.term)
{
case 17:
for (buffer_index = buf_idx; buffer_index < end_index; buffer_index += 2)
{
sam_A = 2 * buffer[buffer_index - 2] - buffer[buffer_index - 4];
buffer[buffer_index] = (int)((weight_A * (long)sam_A + 512) >> 10) + (sam_B = buffer[buffer_index]);
if (sam_A != 0 && sam_B != 0)
weight_A += (((sam_A ^ sam_B) >> 30) | 1) * delta;
//update_weight (weight_A, delta, sam_A, sam_B);
sam_A = 2 * buffer[buffer_index - 1] - buffer[buffer_index - 3];
buffer[buffer_index + 1] = (int)((weight_B * (long)sam_A + 512) >> 10) + (sam_B = buffer[buffer_index + 1]);
if (sam_A != 0 && sam_B != 0)
weight_B += (((sam_A ^ sam_B) >> 30) | 1) * delta;
}
dpp.samples_B[0] = buffer[buffer_index - 1];
dpp.samples_A[0] = buffer[buffer_index - 2];
dpp.samples_B[1] = buffer[buffer_index - 3];
dpp.samples_A[1] = buffer[buffer_index - 4];
break;
case 18:
for (buffer_index = buf_idx; buffer_index < end_index; buffer_index += 2)
{
sam_A = (3 * buffer[buffer_index - 2] - buffer[buffer_index - 4]) >> 1;
buffer[buffer_index] = (int)((weight_A * (long)sam_A + 512) >> 10) + (sam_B = buffer[buffer_index]);
if (sam_A != 0 && sam_B != 0)
weight_A += (((sam_A ^ sam_B) >> 30) | 1) * delta;
sam_A = (3 * buffer[buffer_index - 1] - buffer[buffer_index - 3]) >> 1;
buffer[buffer_index + 1] = (int)((weight_B * (long)sam_A + 512) >> 10) + (sam_B = buffer[buffer_index + 1]);
if (sam_A != 0 && sam_B != 0)
weight_B += (((sam_A ^ sam_B) >> 30) | 1) * delta;